bsc: TC_stats_conn_fail: fix for sccplite

Change the test so OsmoBSC always sends an BSSAP Assignment Failure by
setting the Data Indicator to an invalid value. Previously the test had
assumed that OsmoBSC would always send an Assignment Failure when
requesting CSD as it was not yet implemented.

The test only passed by chance on AoIP: OsmoBSC rejects the CSD
Assignment Request unless it has the Speech Codec List IE for AoIP.

Related: OS#4393
Change-Id: Ia4e8ab01dbadae5c9d7a964c0760dd3b016ab606
---
M bsc/BSC_Tests.ttcn
1 file changed, 20 insertions(+), 1 deletion(-)

diff --git a/bsc/BSC_Tests.ttcn b/bsc/BSC_Tests.ttcn
index 5a22c00..bfab0fa 100644
--- a/bsc/BSC_Tests.ttcn
+++ b/bsc/BSC_Tests.ttcn
@@ -2095,8 +2095,9 @@
 
 	f_statsd_reset();
 
-	/* Establish SDCCH */
+	/* Establish SDCCH (invalid DataIndicator for exp_fail) */
 	ass_cmd.pdu.bssmap.assignmentRequest.channelType := valueof(ts_BSSMAP_IE_ChannelTypeCSD);
+	ass_cmd.pdu.bssmap.assignmentRequest.channelType.speechId_DataIndicator := 'ff'O;
 	f_establish_fully(ass_cmd, exp_fail);
 
 	/* Expect stats to be 0 */

